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' A. H. WOOD.

Gas Regulator.

No. 61,593. v Patented Jan. 29, 1867.

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N. PETERS. PHOTO-LITHOGRAPHEN. WASHINGTON. D C.

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Be it known that I, ALONZO H." W001), of Boston, in the county ofSuffolk, and State of Massachusetts, have invented certain new anduseful improvements in Automatic:Attachments for. Gas Regulators; and Ido hereby declare that the following is a full, clear, and exactdescription of the same, reference heing had to the accompanyingdrawings, which form part of this specification, in which the marks ofreference correspond in all the figures.

One important object of this invention is, to keep up a uniform pressureof the gas at the supply pipe when a greater or lessnumber of burnersare lighted. Another important object is,- to counteract the resistanceof the mercury to the disk when the'same is immersed to a greater orless degree. I accomplish these and other important objects byconstructing automatic self-adjusting weights which will increase ordiminish their force upon the disk, as the same is raised or lowered, bythe greater or less amount of pressure of the gas underneathv the same,thereby counteracting the slightest variations of pressure perceptible;by constructing theweights oi'lhollow glass tubes, which, beingpartially filled with mercury, the slightest movement of the angle ofthe weights causes the mercury to change its position in the same,thereby bringing more or'less weight upon the disk; the weights beingadjusted upon fulcra provided with friction-rolls, are made to act withthe least amount of friction. In the drawings annexed Figurel is aperspective view of my invention. Figure 2 is a sectional view of a gasregulator with the automatic'regulator attached. In the drawingsannexed, A A A A' represent four weights, being composed of glass tubesor vials par:

, tially filled with mercury, 13.. c c c" 0' represent friction-rolls,upon which the vials rest, acting as'a sort oi fulcrum upon which theymove. (1 d d" 02' represent caps to the vials, which are hinged to thepiece e at four points equidistant apart. The piece c has a 'slot inwhich to admit the button 2', having a shank extending downward into theadjusting-screw It, so as to obtain more or less weight from the mercuryby allowing them to move a greater or less distance.- .A cup, n,surrounds the nut'm upon; the top of the disk P, into which smallweights may placed to add greater or less pressure to the regulator, asmay be desired. P is a thin metal disk, with rim immersed in themercury-seat R, situated in a groove around the inner side of the upperchamber of the case S, which is cylindrical in form. From the-centre ofthe disk P extends-a small rod, H, upon the lower end of which is fittedthe mercury-cup T, which forms a seat for the -shaped valves upon thelower end of the tube U. An opening in the bottom of the case serves tolet out any mercury which may run over from the valve- F seats. y is ascrew for closing the opening. F is the inlet, while, G is theoutlet orsupply pipe for the burners. It will he observed that the outer caseforms two apartments, or anupper and'lower chamber, land 2. The gasbeing admitted into the inlet F of the lower chamber, the greater thepressure upon the cup T the more it closes the'openings of'the V-shapedvalves iuthe lower. mercury-seat by raising the cup, while a less amountof pressure allows it to fall, and causes the disk Pto' drop lower intothe upper mercury-seat RF; consequently, the Further the disk extendsinto the mercury the greater is the buo yancy, as a greater amount ofmercury has to be displaced. ,Thus the supply or pressure of the gaswould diminish at the supply pipe or burners in proportion to the numberlit, and increase in proportion to the number of burners closed, whilevice ziersa should be the case. Thus it will be seen that the glass tubeweights partially filled with mercury act automatically, so as tocountern-ct the buoyancy of the disk in the mercury, and keep a nniformpressure of gas corresponding tothe number of burners lit, or closed bythe weights, increasing the pressure according to the number lit, anddecreasing in proportion to the number closed. (See dotted lines in fig.2.) Thus I'ameuabled to overcome the difliculty existing in gasregulators above referred to. I do not confine myself, however,'to anyparticular mechanism to accomplish the desired result, as other meansmechanically equivalent maybe employed; .but describe this as one bestsuited to that class of regulators shown in the drawings, as. having twomercury-seats, to which this mechanism is peculiarly adapted. A similarattachment'of' automatic changing weights may be applied to gasregulators in general, sons to accomplish the important and desirableobject attained upon this particular class of regulators.

Having thus described my invention, what I desire, to secure by LettersPatent, is- Y I claim an automatic gas regulator attachment, having thefunctions and possessing the characteristics substantially as set forth.

, A. H. WOOD. Witnesses:

SrLvnnus WALKsR, M; J. E. Jscons.

